$NetBSD$

--- src/VBox/Runtime/r0drv/netbsd/thread-r0drv-netbsd.c.orig	2016-07-08 22:38:41.522099941 +0000
+++ src/VBox/Runtime/r0drv/netbsd/thread-r0drv-netbsd.c
@@ -0,0 +1,181 @@
+/*  thread-r0drv-netbsd.c $ */
+/** @file
+ * IPRT - Threads (Part 1), Ring-0 Driver, NetBSD.
+ */
+
+/*
+ * Copyright (C) 2007-2015 Oracle Corporation
+ *
+ * This file is part of VirtualBox Open Source Edition (OSE), as
+ * available from http://www.virtualbox.org. This file is free software;
+ * you can redistribute it and/or modify it under the terms of the GNU
+ * General Public License (GPL) as published by the Free Software
+ * Foundation, in version 2 as it comes in the "COPYING" file of the
+ * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+ * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+ * VirtualBox OSE distribution, in which case the provisions of the
+ * CDDL are applicable instead of those of the GPL.
+ *
+ * You may elect to license modified versions of this file under the
+ * terms and conditions of either the GPL or the CDDL or both.
+ */
+
+
+/*********************************************************************************************************************************
+*   Header Files                                                                                                                 *
+*********************************************************************************************************************************/
+#include "the-netbsd-kernel.h"
+#include "internal/iprt.h"
+#include <iprt/thread.h>
+
+#include <iprt/asm.h>
+#include <iprt/asm-amd64-x86.h>
+#include <iprt/assert.h>
+#include <iprt/err.h>
+#include <iprt/mp.h>
+#include "internal/thread.h"
+
+
+RTDECL(RTNATIVETHREAD) RTThreadNativeSelf(void)
+{
+    return (RTNATIVETHREAD)curthread;
+}
+
+
+static int rtR0ThreadNbsdSleepCommon(RTMSINTERVAL cMillies)
+{
+    int rc;
+    int cTicks;
+
+    /*
+     * 0 ms sleep -> yield.
+     */
+    if (!cMillies)
+    {
+        RTThreadYield();
+        return VINF_SUCCESS;
+    }
+
+    /*
+     * Translate milliseconds into ticks and go to sleep.
+     */
+    if (cMillies != RT_INDEFINITE_WAIT)
+    {
+        if (hz == 1000)
+            cTicks = cMillies;
+        else if (hz == 100)
+            cTicks = cMillies / 10;
+        else
+        {
+            int64_t cTicks64 = ((uint64_t)cMillies * hz) / 1000;
+            cTicks = (int)cTicks64;
+            if (cTicks != cTicks64)
+                cTicks = INT_MAX;
+        }
+    }
+    else
+        cTicks = 0;     /* requires giant lock! */
+
+    rc = tsleep((void *)RTThreadSleep,
+                PZERO | PCATCH,
+                "iprtsl",           /* max 6 chars */
+                cTicks);
+    switch (rc)
+    {
+        case 0:
+            return VINF_SUCCESS;
+        case EWOULDBLOCK:
+            return VERR_TIMEOUT;
+        case EINTR:
+        case ERESTART:
+            return VERR_INTERRUPTED;
+        default:
+            AssertMsgFailed(("%d\n", rc));
+            return VERR_NO_TRANSLATION;
+    }
+}
+
+
+RTDECL(int) RTThreadSleep(RTMSINTERVAL cMillies)
+{
+    return rtR0ThreadNbsdSleepCommon(cMillies);
+}
+
+
+RTDECL(int) RTThreadSleepNoLog(RTMSINTERVAL cMillies)
+{
+    return rtR0ThreadNbsdSleepCommon(cMillies);
+}
+
+
+RTDECL(bool) RTThreadYield(void)
+{
+    kern_yield(curthread->td_user_pri);
+    return false; /** @todo figure this one ... */
+}
+
+
+RTDECL(bool) RTThreadPreemptIsEnabled(RTTHREAD hThread)
+{
+    Assert(hThread == NIL_RTTHREAD);
+
+    return curthread->td_critnest == 0
+        && ASMIntAreEnabled(); /** @todo is there a native netbsd function/macro for this? */
+}
+
+
+RTDECL(bool) RTThreadPreemptIsPending(RTTHREAD hThread)
+{
+    Assert(hThread == NIL_RTTHREAD);
+
+    return curthread->td_owepreempt == 1;
+}
+
+
+RTDECL(bool) RTThreadPreemptIsPendingTrusty(void)
+{
+    /* yes, RTThreadPreemptIsPending is reliable. */
+    return true;
+}
+
+
+RTDECL(bool) RTThreadPreemptIsPossible(void)
+{
+    /* yes, kernel preemption is possible. */
+    return true;
+}
+
+
+RTDECL(void) RTThreadPreemptDisable(PRTTHREADPREEMPTSTATE pState)
+{
+    AssertPtr(pState);
+    Assert(pState->u32Reserved == 0);
+    pState->u32Reserved = 42;
+
+    critical_enter();
+    RT_ASSERT_PREEMPT_CPUID_DISABLE(pState);
+}
+
+
+RTDECL(void) RTThreadPreemptRestore(PRTTHREADPREEMPTSTATE pState)
+{
+    AssertPtr(pState);
+    Assert(pState->u32Reserved == 42);
+    pState->u32Reserved = 0;
+
+    RT_ASSERT_PREEMPT_CPUID_RESTORE(pState);
+    critical_exit();
+}
+
+
+RTDECL(bool) RTThreadIsInInterrupt(RTTHREAD hThread)
+{
+    Assert(hThread == NIL_RTTHREAD); NOREF(hThread);
+    /** @todo NetBSD: Implement RTThreadIsInInterrupt. Required for guest
+     *        additions! */
+    return !ASMIntAreEnabled();
+}
